# US 10,117,813 B2 · Process of forming crystals for use in a personal care composition

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- Number: US 10,117,813 B2
- Document ID: US10117813B2
- Status: Granted
- Kind: B2
- Application number: 15/675,287
- Filed: 2017-08-11
- Published: 2018-02-15
- Granted: 2018-11-06
- Earliest claimed: 2011-06-23
- Assignees: The Procter & Gamble Company
- Applicants: The Procter & Gamble Company
- Inventors: Geoffrey Marc Wise; Nicholas William Geary; David Edward Rose
- Web page: https://patentgrep.com/patent/US10117813B2

## CPC

- A61K 8/06: Emulsions
- A61K 8/062: {Oil-in-water emulsions}
- A61K 8/37: Esters of carboxylic acids
- A61K 8/375: {the alcohol moiety containing more than one hydroxy group}
- A61K 8/463: {containing sulfuric acid derivatives, e.g. sodium lauryl sulfate}
- A61K 8/58: containing atoms other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur or phosphorus
- A61K 31/4365: the heterocyclic ring system having sulfur as a ring hetero atom, e.g. ticlopidine
- A61P 17/00: Drugs for dermatological disorders
- A61P 31/00: Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
- A61Q 5/02: Preparations for cleaning the hair
- A61Q 17/005: {Antimicrobial preparations}
- A61Q 19/00: Preparations for care of the skin
- A61Q 19/10: Washing or bathing preparations
- A61K 2800/412: Microsized, i.e. having sizes between 0.1 and 100 microns
- A61K 2800/52: Stabilizers
- A61K 2800/596: Mixtures of surface active compounds
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61P: SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS

## Abstract

A method of making a stable detersive surfactant containing personal care composition comprising the steps of emulsifying a stabilizing agent in the presence of anionic surfactant to form an emulsion containing droplets having a particle size of from about 0.1 to about 10 um. These particles are then cooled to form a stabilizing premix at a rate of about 10 to about 1000 C/min to form crystals from the droplets, the crystals having a maximum dimension of about 0.1 to about 3 um. These crystals are then added to a detersive surfactant containing personal care composition to increase stability.

## Claims

### Claim 1

A method of making a stable, detersive surfactant containing personal care composition comprising:
(a) emulsifying from about 4% to about 30% of a stabilizing agent in the presence of from about 2% to about 30% of an anionic surfactant and from about 0.05% to about 5% of an organic fatty alcohol or fatty acid to form an emulsion at a temperature of about 5 to about 20° C. above the melting point of the stabilizing agent, to form an emulsion wherein:
(i) the stabilizing agent is ethylene glycol distearate;
(ii) the anionic surfactant is selected from the group consisting of an alkyl sulfate, an alkyl ether sulfate, and a combination thereof, and
(iii) the formed emulsion contains droplets having a particle size of about 0.1 to about 10 um;
(b) cooling the emulsion to form a stabilizing premix at a rate of about 10 to about 1000 C/min to a temperature of about to a temperature of about 5° C. to about 30° C. below the melting point of ethylene glycol distearate to form crystals from the droplets, the crystals having a maximum dimension of about 0.1 to about 3 um and an aspect ratio of about 2 to about 1000; and
(c) adding the stabilizing premix to a detersive surfactant containing personal care composition.

### Claim 2 (depends on 1)

The method of claim 1, wherein the organic fatty acid or alcohol has a carbon chain length of from about 8 to about 20.

### Claim 3 (depends on 1)

The method of claim 1, wherein the crystals have an aspect ratio of from about 2 to about 1000.

### Claim 4 (depends on 1)

The method of claim 1, wherein the emulsification of the crystallizing agent employs an agitated tank, a static mixer, an orifice plate, a rotor/stator mill, high energy homogenizer, or combinations thereof.

### Claim 5 (depends on 1)

The method of claim 1, wherein the cooling of the emulsion employs a heat exchanger in a single pass or recirculation process.

### Claim 6 (depends on 1)

The method of claim 1, wherein less than 2% of the personal care composition separates to form a second phase at the top or bottom of the composition when 85 g of the personal care composition is placed in a sealed 4 cm diameter glass jar at 40° C. for 60 days.